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• C, Linux: Receiving data from multiple multicast address on same port - how to distinguish them?

  - by Gigi

  2 vote down star I have an application that is receiving data from multiple multicast sources on the same port. I am able to receive the data. However, I am trying to account for statistics of each group (i.e. msgs received, bytes received) and all the data is getting mixed up. Does anyone know how to solved this problem? If I try to look at the sender's address, it is not the multicast address, but rather the IP of the sending machine. I am using the following socket options: struct ip_mreq mreq; mreq.imr_multiaddr.s_addr = inet_addr("224.1.2.3"); mreq.imr_interface.s_addr = INADDR_ANY; setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)); and also: setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &reuse, sizeof(reuse)); I appreciate any help!!!

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• Java library to encode / decode AMF

  - by Ceilingfish

  Hi chaps, I currently have a Java server that talks to a Flash client by passing JSON encoded data over a binary socket connection. Is there a way on either side to encode / decode packets as AMF instead of JSON? It seems to me that there should be some native support in Flash player for doing this? All the implementations I have found of AMF serialization seem to be embedded inside an application framework. Simiarly so, does anyone know if it's possible to decode AMF packets independently of a connection implementation in Flash?

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• How to make mysql accept connections externally

  - by Tam

  I have a VPS and I want to make mysql DB accept connection externally (from my PC for instance). I have Debian Linux installed on the server. I checked some tutorials online and they said to comment out: bind-address = 127.0.0.1 But this didn't seem to help! is there anything specific for VPSs? or Am I missing something else? The command that runs mysql is: /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock

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• Linux servers going into Halt when pressing Control-D in putty or exit in the shell

  - by Itai Ganot

  Since today at noon, there's a number of Linux CentOS servers which are going to Halt whenever i type exit or use Control-D to close the putty window. Did anyone encounter this weird behavior before? I've checked the aliases list on the servers and there is no alias regarding halt command. After the server came online i've checked the history and saw a "logout" command there but nothing which is related to Halt. At first, i thought it happens only from my computer but later i realized that it happens to everyone which types exit, logout or control+d. 2 of these server are our main iptables firewalls and so it's super critical, your assistance is much appreciated. It looks like that, and it only happens on servers with active IPTables: [root@srv1 bin]# ssh srv2 root@srv2's password: Last login: Sun Nov 11 17:19:41 2012 from 192.168.12.98 [root@srv2 ~]# vim /etc/crontab [root@srv2 ~]# exit logout Broadcast message from root (pts/1) (Tue Nov 13 10:44:04 2012): The system is going down for system halt NOW! Connection to srv2 closed. [root@srv1 bin]# In my troubleshooting steps i came across the command strace, and so i've opened two bash windows to one of the problematic server and i used strace -p PID_of_bash. When i typed in exit in the first shell it did go to halt, attached is the strace output, if you can check it out and tell me if you see anything suspicious i'd be more than thankful. RER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGALRM, {0x4484f0, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTSTP, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTTOU, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTTIN, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGWINCH, {0x448370, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c410, [], SA_RESTORER|SA_RESTART, 0x2b0e45a8f2f0}, 8) = 0 socket(PF_NETLINK, SOCK_RAW, 9) = 3 sendmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(2)=[{"\25\0\0\0d\4\1\0\0\0\0\0\0\0\0\0", 16}, {"exit\0", 5}], msg_controllen=0, msg_flags=0}, 0) = 21 close(3) = 0 rt_sigaction(SIGINT, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 write(2, "logout\n", 7) = 7 write(2, "There are stopped jobs.\n", 24) = 24 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigaction(SIGINT, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_BLOCK, [INT CHLD], [], 8) = 0 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2b0e45db6fe0) = 23717 setpgid(23717, 23717) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 close(3) = 0 close(4) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [CHLD], 8) = 0 ioctl(255, TIOCSPGRP, [23717]) = 0 rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WSTOPPED|WCONTINUED, NULL) = 23717 rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [CHLD], 8) = 0 ioctl(255, TIOCSPGRP, [20458]) = 0 rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 ioctl(255, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0 ioctl(255, TIOCGWINSZ, {ws_row=53, ws_col=211, ws_xpixel=0, ws_ypixel=0}) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- wait4(-1, 0x7fff395da984, WNOHANG|WSTOPPED|WCONTINUED, NULL) = 0 rt_sigreturn(0x11) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0 ioctl(255, TIOCSPGRP, [20458]) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigaction(SIGINT, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0 ioctl(0, TIOCGWINSZ, {ws_row=53, ws_col=211, ws_xpixel=0, ws_ypixel=0}) = 0 ioctl(0, TIOCSWINSZ, {ws_row=53, ws_col=211, ws_xpixel=0, ws_ypixel=0}) = 0 ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0 ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig -icanon -echo ...}) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, [INT QUIT ALRM TSTP TTIN TTOU], [], 8) = 0 rt_sigaction(SIGINT, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTERM, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTERM, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGQUIT, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGQUIT, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGALRM, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x4484f0, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTSTP, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTSTP, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTTOU, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTTOU, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTTIN, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTTIN, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigaction(SIGWINCH, {0x47c410, [], SA_RESTORER|SA_RESTART, 0x2b0e45a8f2f0}, {0x448370, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 write(2, "[root@g2-lga ~]# ", 17) = 17 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 read(0, "e", 1) = 1 write(2, "e", 1) = 1 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 read(0, "x", 1) = 1 write(2, "x", 1) = 1 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 read(0, "i", 1) = 1 write(2, "i", 1) = 1 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 read(0, "t", 1) = 1 write(2, "t", 1) = 1 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 read(0, "\r", 1) = 1 write(2, "\n", 1) = 1 rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0 ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig icanon echo ...}) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigaction(SIGINT, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTERM, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGQUIT, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGALRM, {0x4484f0, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c450, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTSTP, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTTOU, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGTTIN, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x1, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 rt_sigaction(SIGWINCH, {0x448370, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x47c410, [], SA_RESTORER|SA_RESTART, 0x2b0e45a8f2f0}, 8) = 0 socket(PF_NETLINK, SOCK_RAW, 9) = 3 sendmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(2)=[{"\25\0\0\0d\4\1\0\0\0\0\0\0\0\0\0", 16}, {"exit\0", 5}], msg_controllen=0, msg_flags=0}, 0) = 21 close(3) = 0 rt_sigaction(SIGINT, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 write(2, "logout\n", 7) = 7 open("/root/.bash_logout", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=24, ...}) = 0 read(3, "# ~/.bash_logout\n\nclear\n", 24) = 24 close(3) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 stat(".", {st_mode=S_IFDIR|0750, st_size=12288, ...}) = 0 stat("/usr/kerberos/sbin/clear", 0x7fff395da960) = -1 ENOENT (No such file or directory) stat("/usr/kerberos/bin/clear", 0x7fff395da960) = -1 ENOENT (No such file or directory) stat("/usr/local/sbin/clear", 0x7fff395da960) = -1 ENOENT (No such file or directory) stat("/usr/local/bin/clear", 0x7fff395da960) = -1 ENOENT (No such file or directory) stat("/sbin/clear", 0x7fff395da960) = -1 ENOENT (No such file or directory) stat("/bin/clear", 0x7fff395da960) = -1 ENOENT (No such file or directory) stat("/usr/sbin/clear", 0x7fff395da960) = -1 ENOENT (No such file or directory) stat("/usr/bin/clear", {st_mode=S_IFREG|0755, st_size=12712, ...}) = 0 access("/usr/bin/clear", X_OK) = 0 access("/usr/bin/clear", R_OK) = 0 stat("/usr/bin/clear", {st_mode=S_IFREG|0755, st_size=12712, ...}) = 0 access("/usr/bin/clear", X_OK) = 0 access("/usr/bin/clear", R_OK) = 0 rt_sigprocmask(SIG_BLOCK, [INT CHLD], [], 8) = 0 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2b0e45db6fe0) = 23726 setpgid(23726, 23726) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 close(3) = 0 close(4) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [CHLD], 8) = 0 ioctl(255, TIOCSPGRP, [23726]) = 0 rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 wait4(-1, Broadcast message from root (pts/0) (Wed Nov 14 12:41:44 2012): The system is going down for system halt NOW! [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WSTOPPED|WCONTINUED, NULL) = 23726 rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [CHLD], 8) = 0 ioctl(255, TIOCSPGRP, [20458]) = 0 rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 ioctl(255, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0 ioctl(255, TIOCGWINSZ, {ws_row=53, ws_col=211, ws_xpixel=0, ws_ypixel=0}) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- wait4(-1, 0x7fff395da634, WNOHANG|WSTOPPED|WCONTINUED, NULL) = 0 rt_sigreturn(0x11) = 0 open("/etc/bash.bash_logout", O_RDONLY) = -1 ENOENT (No such file or directory) rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigaction(SIGINT, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, {0x448700, [], SA_RESTORER, 0x2b0e45a8f2f0}, 8) = 0 stat("/root/.bash_history", {st_mode=S_IFREG|0600, st_size=28900, ...}) = 0 open("/root/.bash_history", O_WRONLY|O_APPEND) = 3 write(3, "cd /etc/profile.d/\nls\nls -alrt\ng"..., 1120) = 1120 close(3) = 0 open("/root/.bash_history", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0600, st_size=30020, ...}) = 0 read(3, "history \nping g1-lga\nping g1-lga"..., 30020) = 30020 close(3) = 0 open("/root/.bash_history", O_WRONLY|O_TRUNC) = 3 write(3, "grep \"216.18\" *\nhistory \nexit\nvi"..., 27609) = 27609 close(3) = 0 kill(4294965658, SIGTERM) = 0 kill(4294965658, SIGCONT) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- wait4(-1, [{WIFSIGNALED(s) && WTERMSIG(s) == SIGTERM}], WNOHANG|WSTOPPED|WCONTINUED, NULL) = 1638 wait4(-1, 0x7fff395dac34, WNOHANG|WSTOPPED|WCONTINUED, NULL) = -1 ECHILD (No child processes) rt_sigreturn(0x11) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- wait4(-1, 0x7fff395dac34, WNOHANG|WSTOPPED|WCONTINUED, NULL) = -1 ECHILD (No child processes) rt_sigreturn(0xffffffffffffffff) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0 ioctl(255, TIOCSPGRP, [20458]) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 setpgid(0, 20458) = -1 EPERM (Operation not permitted) exit_group(1) = ? Process 20458 detached [root@g2-lga ~]#

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• Anyone up to creating a tomcat based alternative for GAE?

  - by bach

  Hi, If we had the possibility to run GAE app without any code change on our servlet engine that would be great because: in case that google changes their billing policy we can just jump to our own server or in case their current policy doesn't fit our app needs we can do stuff which is not allowed in the GAE, compromising a 1 JVM, 1 DB We don't actually need a distributed system but more of a realtime system with synchronize, true locking mechanisms, other servers/software installed on the server machine, socket interface etc... Such a package should include at least: TomCat (or equivalent) DataNucleus Access Platform (Task Queue service) Any idea if it's easy to get such a thing or if it's already exist somewhere? Thanks

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• MIDI on Android: Java and/or AIR libraries

  - by yar

  I've been contemplating (re)building an app on iPad for some time, where I would use objective-C and DSMI to send MIDI signals to a host computer. This is not bad (I mean, except for actually writing the app). Now I'm contemplating perhaps developing the app for Android tablets (TBA). In Java, what options are available for MIDI message communication? I'm quite familiar with javax.sound.midi, but then I would need a virtual MIDI port to send messages to the host. On the other hand, if the app were done in Adobe AIR, what options would I have available for communicating with MIDI? Obviously another option is to send/receive messages over a TCP/IP socket to a Java host, and talk that way, but it sounds a tad cumbersome... or perhaps not? DSMI does use a host program, after all.

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• How to create a persistent connection using AS3 Sockets for a chat client

  - by Vivek

  I want to create a chat client in flash/flex for a chat server,something like a MUD/MOO client but I'm unable to create a persistent connection . I've been using the AS3 Socket class,but I'm getting disconnected from the server side,soon after the connection is made but the client still shows the 'connected' property as true .The server is asynchronous and was written in python using asyncore/asynchat, it works fine with most open source MOO/MUD clients . I tried connecting my program to a simple synchronous echo server,here both read and write worked fine with no disconnections from either side . So my question is how do I make a persistent connection with the server?

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• Implementing OFX specification with javascript

  - by John Langston

  Hey all, I am working on a personal project and need to retrieve financial data. After looking around how this is normally done it seems you can pay lots of money and license a service like Yodlee to get this data for you or you can implement a OFX client like wesabe has to communicate with financial institutions. Seeing as I don't have lots of money and wouldn't mind the challenge I decided to try to implement the ofx spec (unless one of you can suggest a cheap/free alternative!). I looked around for some ofx libraries other people have already written for use but didn't find anything that looked too great. I was wondering if anyone knew if it would be a bad idea to attempt this in Javascript (using XMLSocket from actionscript to handle the actual socket communication). If there is some really bad reason why I shouldn't do this please bring it up. If there is I'll just do it in Java but I think it would be neat to have it completely in javascript so it runs client-side. Anyways I was hoping for some helpful input, thanks.

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• C# Proxy using Sockets, how should I do this?

  - by Kin

  I'm writing a proxy using .NET and C#. I haven't done much Socket programming, and I am not sure the best way to go about it. What would be the best way to implement this? Should I use Synchronous Sockets, Asynchronous sockets? Please help! It must... Accept Connections from the client on two different ports, and be able to receive data on both ports at the same time. Connect to the server on two different ports, and be able to send data on both ports as the same time. Immediately connect to the server and start forwarding packets as soon as a client connection is made. Forward packets in the same order they were received. Be as low latency as possible. I don't need the ability for multiple clients to connect to the proxy, but it would be a nice feature if its easy to implement. Client --------- Proxy ------- Server ---|-----------------|----------------| Port <-------- Port <------- Port Port <-------- Port <------- Port

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• MIDI on Android: Libs and So Forth

  - by yar

  I've been contemplating (re)building an app on iPad for some time, where I would use objective-C and DSMI to send MIDI signals to a host computer. This is not bad (I mean, except for actually writing the app). Now I'm contemplating perhaps developing the app for Android tablets (TBA). In Java, what options are available for MIDI message communication? I'm quite familiar with javax.sound.midi, but then I would need a virtual MIDI port to send messages to the host. On the other hand, if the app were done in Adobe AIR, what options would I have available for communicating with MIDI? Obviously another option is to send/receive messages over a TCP/IP socket to a Java host, and talk that way, but it sounds a tad cumbersome... or perhaps not? DSMI does use a host program, after all.

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• Where to place java applet policy file?

  - by makdere

  Hi all, I am working on an artificial intelligence project which is a logic game and aims two user connecting to the server on the network who acts as an Admin and then start to play one by one. In order to create connections, i have a server code which is just listening on localhost:8000 and assigning team values to the clients as they arrive. After connecting, clients make their move under Admin's control. The question is that when i try to put my code to work in the browser it fails with the following error: java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:8000 connect,resolve) Even though i have created my own policy, first granting only Socket access permission to the codebase of my project folder (file:///home/xxx/projects/-), after it didnt work i granted all permissions from all codebase. I tried placing my policy file both in the home directory and in the same directory where my applet code resides. Appreciate any tips, thanks.

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• How is 'processing credit card data' defined (PCI)?

  - by Chris

  If i have a web application and i receive credit card data transmitted via a POST request by a web browser over HTTPS and instantly open a socket (SSL) to a remote PCI compilant card processor to forward the data and wait for a response, am i allowed to do that? or is this receiving the data with my application and forwarding it already subject of "processing credit card data"? if i create an iframe that is displayed in a client browser to enter cc data and this iframe posts the data via HTTPS to remote card processor (directly!) is this already a case of processing credit card data? even if my application code 'doesnt touch' the entered data with any event handlers? i'm interested in the definition "credit card data processing". when does it start to be a cc data processing application? can somebody maybe point me to that section in PCI-DSS standard that clearly defines when you start to 'be a processing application'? Thanks,

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• Writing asynchronously on a stream in cocoa

  - by Richard Ibarra

  Hi folks I have been trying to find any way for writing asynchronously on a stream in Cocoa. I have a set of events in my applications which will try to send data through the socket but i can't be blocked during this transmission due to design terms. I have tried setting a delegate on the output stream and check the event NSStreamEventHasSpaceAvailable but I don't know how this can be combined with the events that put data into the stream. Is there anyway for doing that? I thought using NSThread but I guess there is a better option. Cheers

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• Tutorials/Books on using Mono to develop RESTful webservices?

  - by max

  Hi, anyone out there got any pointers to good links/tutorials/books on developing webservices with Mono? In more detail, I am interested in using Mono from project start on a Linux host developing in C# using Visual Studio for development, ideally with remote debugging if that is realistic developing web-services in MONO accessible in a RESTful manner, returning JSON hiding the services processes behind an Apache access the services either via javascript/AJAX or from a thin script layer written in PHP scalability is important for me unit-testing of webservices Any recommendations for material I could sift through to get a good head-start? I might add that I'm C#/.NET savvy, but not in the context of web development. I've been using it since it came out, but mainly for internal server-client applications where the clients were Windows desktop apps and the communication layer was remoting or, sometimes, more low-level socket-based. Thanks, max

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• How to host your own http-like server using ServiceHost or its analog capable to host WCF services?

  - by Ole Jak

  I use ServiceHost for hosting WCF cervices. I want to host near to my WCF services my own tcp programm (like WCF service but with out WCF) for direct sockets operations (like lien to some sort of broadcasting TCP stream) I want to use ServiceHost for somehow simplyfiing proces of creating my TCP sender\listener, to somehow control namespaces (so I would be able to let my clients to send TCP streams directly into my service using some nice URLs like www.example.com:34123/myserver/stream?id=1 or www.example.com:34123/myserver/stream?id=222 and so that I will not be bothered with Idea of 1 client for 1 socket at one time moment, BTW I realy want to keep my WCF services on the same port as my own server or what it is...) Can any body please help me with this?

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• Exception handling in Boost.Asio

  - by Alex B

  Boost.Asio documentation suggests the following exception handling pattern: boost::asio::io_service io_service; ... for (;;) { try { io_service.run(); break; // run() exited normally } catch (my_exception& e) { // Deal with exception as appropriate. } } The problem with it is that the context of exception is lost at the point when it's handled. For example, if I have multiple socket sessions going on, I don't know which one caused the exception to be thrown. What would be a better way to handle the exceptions from asynchronous handlers without wrapping them in try/catch blocks?

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• Rails: Display Maintenance Page if No Database Connection Available

  - by RobB

  I'm looking for a solution that will allow my rails app to render a user-friendly maintenance page when there is no Mysql server available to connect to. Normally a Mysql::Error is thrown from the mysql connection adapter in active_record. Something like: /!\ FAILSAFE /!\ Wed May 26 11:40:14 -0700 2010 Status: 500 Internal Server Error Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' Is there a low-overhead way to catch this error and render a maintenance page instead? I'm assuming that since connections are actually made in the active_record mysql adapter the app never makes it to the controller stack before it throws the error, so you can't catch it in a controller. Any input would be greatly appreciated.

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• IO completion port key confusion

  - by Richard Tew

  I'm writing an IO completion port based server (source code here) using the Windows DLL API in Python using the ctypes module. But this is a pretty direct usage of the API and this question is directed at those who have a knowledge of IOCP, not Python. As I understand the documentation for CreateIoCompletionPort, you specify your "user defined" completion key when you call this function with a file handle (in my case a socket) you are associating with the created IOCP. When you get around to calling GetQueuedCompletionStatus, you get a completion key value along with a pointer to an overlapped object. The completion key should identify what overlapped object and request has completed. However, let's say I pass in 100 as the completion key in my CreateIoCompletionPort call with an overlapped object. When the same overlapped object has its IO completed and it arrives back through GetQueuedCompletionStatus, the completion key that accompanies it is much larger and bares no resemblance to the original value of 100. Am I misunderstanding how the completion key works, or must I be doing it wrong in the source code I linked above?

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• Load balancer - how to write one for a custom application?

  - by Poni

  Hi! I've written a simple server application which will run distributed on several machines. My question is how does a network load balancer works, in general? I've heard of round-robin and other algorithms, but what I haven't got answer to is how does the process really goes? In socket terms. The client connects to one of the load balancer machines, asks for a "free-to-connect-to" server and simply connects to it? That's the simpliest way I can think of. .. or, does it use the load balancer as a proxy (that implies that all the NBs must be always connected to the application servers, and data is transferred through them)? It's more of a general question. How would you do this? Thank you all!

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• Endianness manipulation - is there a C library for this?

  - by Malvineous

  Hi all, With the sort of programs I write (working with raw file data) I often need functions to convert between big and little endian. Usually I write these myself (which is covered by many other posts here) but I'm not that keen on doing this for a number of reasons - the main one being lack of testing. I don't really want to spend ages testing my code in a big endian emulator, and often just omit the code for big endian machines altogether. I also would rather make use of faster functions provided by various compilers, while still keeping my programs cross-platform. The only things I can find are socket calls like htons() but they require different #include files on each platform, and some GPL code like this, however that particular file, while comprehensive, seems to miss out on some of the high performance functions provided by some compilers. So, does anyone know of a library (ideally just a .h file) that is well tested and provides a standard set of functions for dealing with endianness across many compilers and platforms?

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• Artificially create a connection timeout error

  - by Mark Ingram

  I've had a bug in our software that occurs when I receive a connection timeout. These errors are very rare (usually when my connection gets dropped by our internal network). How can I generate this kind of effect artificially so I can test our software? If it matters the app is written in C++/MFC using CAsyncSocket classes. Edit: I've tried using a non-existant host, and I get the socket error: WSAEINVAL (10022) Invalid argument My next attempt was to use Alexander's suggestion of connecting to a different port, e.g. 81 (on my own server though). That worked great. Exactly the same as a dropped connection (60 second wait, then error). Thank you!

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• An existing connection was forcibly closed by the remote host

  - by peter

  I am working with a commercial application which is throwing a SocketException with the message, An existing connection was forcibly closed by the remote host This happens with a socket connection between client and server. The connection is alive and well, and heaps of data is being transferred, but it then becomes disconnected out of nowhere. Has anybody seen this before? What could the causes be? I can kind of guess a few causes, but also is there any way to add more into this code to work out what the cause could be? Any comments / ideas are welcome. Thanks.

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• Optimal Sharing of heavy computation job using Snow and/or multicore

  - by James

  Hi, I have the following problem. First my environment, I have two 24-CPU servers to work with and one big job (resampling a large dataset) to share among them. I've setup multicore and (a socket) Snow cluster on each. As a high-level interface I'm using foreach. What is the optimal sharing of the job? Should I setup a Snow cluster using CPUs from both machines and split the job that way (i.e. use doSNOW for the foreach loop). Or should I use the two servers separately and use multicore on each server (i.e. split the job in two chunks, run them on each server and then stich it back together). Basically what is an easy way to: 1. Keep communication between servers down (since this is probably the slowest bit). 2. Ensure that the random numbers generated in the servers are not highly correlated.

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• Determining whether compiling on Windows or other system

  - by NumberFour

  Hi, Im currently developing a cross-platform C application. Is there any compiler macro which is defined only during compilation on Windows, so I can #ifdef some Windows specific #includes? Typical example is selecting between WinSock and Berkeley sockets headers: #ifdef _WINDOWS #include <winsock.h> #else #include <sys/socket.h> #include <netinet/in.h> #include <sys/un.h> #include <arpa/inet.h> #include <netdb.h> #endif So the thing Im looking for is something like that _WINDOWS macro. Thanks for any tips.

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• Writing a telnet client

  - by MAC

  HI, I have a device that exposes a telnet interface which you can log into using a username and password and then manipulate the working of the device. I have to write a C program that hides the telnet aspect from the client and instead provides an interface for the user to control the device. What would be a good way to proceed. I tried writing a simple socket program but it stops at the login prompt. My guess is that i am not following the TCP protocol. Has anyone attempted this, is there an opensource library out there to do this? Thanks

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